Creating an art recommending web app using the Harvard Art API - part 6: Code review & Deployment

9. Code review

9.1 Removing empty paintings

In our renderPaintings function we’ll check for each painting if the imgPath is known, if not the painting will be set to display=none. We have to set the other paintings back to display=block:

if(imgPath) {
    elements.paintings[i].style.display = 'block';
    elements.paintingImg[i].src = imgPath;
    elements.paintingImg[i].parentNode.setAttribute('data-year', year);
    elements.paintingImg[i].parentNode.setAttribute('data-desc', desc);
    elements.paintingImg[i].parentNode.setAttribute('data-artist', artist);
    elements.paintingImg[i].parentNode.setAttribute('data-division', division);
    elements.paintingImg[i].parentNode.setAttribute('data-objectnumber', objectnumber);
} else {
    x++;
    elements.paintings[i].style.display = 'none';
    console.log(elements.paintings.length);
    if (x == elements.paintings.length) detailView.noResults();
}

9.2 Showing painting loader spinner

Add class ‘loading’ to each image in the index.html and we will add a background to this image, so the user will see the loading spinner untill the image is ready and will overlay the background.

.loading {
    background: transparent url('/img/spinner.gif') center no-repeat;
}

9.3 Showing loading spinner on startup

For this we will add an overlay div on top of everything else, and remove the overlay when the window has loaded fully.

<div class="overlay"><h1>Loading Smartart application</h1></div>
.overlay {
    position: absolute;
    width: 100%;
    height: 100%;
    z-index: 999;
    background: #f4f4f4;
    display: flex;
    align-items: center;
    justify-content: center;
}

At the end of our index file we add:

// Remove layer when all content has loaded
window.addEventListener('load', function() {
    elements.overlay.style.display = "none";
})

Done!

10. Deployment

Let’s deploy our app to an AWS server with continuous deployment. Meaning every time we commit to our github repository, our live app gets updated as well.

10.1 AWS Amplify

AWS amplify makes sure every time you’ll commit to you github repository, the webapp get updated. THis is called continuous deployment.

10.2 FTP

Upload all the contents from your /dist folder to your FTP and you are done!

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